Motronic Engine Control Units (ECU) used in BMW's during 1980's and 1990's:

Notes:

1. This list is not yet complete. We know of Motronic versions that are not yet on this list. Whenever we get the details confirmed of such boxes we will add the information here.

2. Some Motronic ECU's (including the 745i, E23) have a 8 position selector switch, which adapts fuel and ignition timing for the quality of fuel available in different countries. This switch is not meant to increase performance! Bosh service documents state "Unnecessary adjustment to the switch though, leads to poor driveability, and particularly to "search" during overrun or to increased fuel consumption, in some cases even to engine damage"!

BMW Model

Chassis

Engine

In production

Bosh Number

Version

318is

E30

M42/B18

90-91

0 261 200 175

Bosch Motronic M1.7

318i/is

E36

M42disa/B18

92-12/93

0 261 200 990

Bosch Motronic M1.7

318i/is

E36

M42disaII/B18

1/94-12/94

0 261 203 282

Bosch Motronic M1.7.2

318i/is/Ti

E36

M42/B18 DISA2

1/95-->

0 261 203 282

Bosch Motronic M1.7.2 w/ EWS-II

318i/is/Ti

E36

M42/B18 DISA2

1/95-->

0 261 203 357

Bosch Motronic M1.7.2 w/ EWS-II

318i/is/Ti

E36

M44/B19

96-->

0 261 203 667

Bosch Motronic M5.2 (OBD-II)

Z3

E36

1.8L 8V (M44/B18)

96-->

Bosch Motronic M1.7.3

Z3

E36

M44/B19

96-->

0 261 203 667

Bosch Motronic M5.2 (OBD-II)

325e/es

E30

M20/B27

9/84-9/87

0 261 200 027

Bosch Motronic Basic M1.0

325

E30

M20/B27

88

0 261 200 154

Bosch Motronic M1.1

325i/is/iX

E30

M20/B25

87-91

0 261 200 153

Bosch Motronic M1.1

325i/is/iX

E30

M20/B25

87-91

0 261 200 173

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 351

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 380

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 382

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 524

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 525

Bosch Motronic M1.3

325i/is/iX

E30

M20/B25

87-91

0 261 200 526

Bosch Motronic M1.3

M3

E30

S14/B23

88-91

0 261 200 071

Bosch Motronic M1.0 Motorsport

M3 - Evo2

E30

S14/B23

89

0 261 200 090

Bosch Motronic M1.0 Motorsport

M3 - Evo3

E30

S14/B25

89

0 261 200 092

Bosch Motronic M1.0 Motorsport

325i/is

E36

M50/B25

thru 8/91

0 261 200 403

Bosch Motronic M3.1

325i/is

E36

M50/B25

9/91-8/92

0 261 200 402

Bosch Motronic M3.1

325i/is/ic

E36

M50tu/B25

9/92-12/94

0 261 200 413

Bosch Motronic M3.3.1

325i/is/ic

E36

M50tu/B25

1/95-->

0 261 200 413

Bosch Motronic M3.3.1 w/ EWS-II

328i

E36

M52/B28

96-->

Bosch Motronic MS41.1 (OBD-II)

M3 - Euro

E36

S50/B30

93-95

0 261 203 075

Bosch Motronic M3.3

M3

E36

S50us/B30

thru 12/94

0 261 203 506

Bosch Motronic M3.3.1

M3

E36

S50us/B30

1/95-->

0 261 200 413

Bosch Motronic M3.3.1 w/ EWS-II

M3

E36

S50us/B32

96-->

Bosch Motronic MS41.1 (OBD-II)

525i

E34

M20/B25

89-90

0 261 200 173

Bosch Motronic M1.3

525i

E34

M20/B25

89-90

0 261 200 524

Bosch Motronic M1.3

525i

E34

M50/B25

thru 8/91

0 261 200 405

Bosch Motronic M3.1

525i/iT

E34

M50/B25

9/91-1/92

0 261 200 403

Bosch Motronic M3.1

525i/iT

E34

M50/B25

2/92-93

0 261 200 402

Bosch Motronic M3.1

525i/iT

E34

M50tu/B25

93-12/94

0 261 200 413

Bosch Motronic M3.3.1

525i/iT

E34

M50tu/B25

1/95-->

0 261 200 413

Bosch Motronic M3.3.1 w/ EWS-II

528i

E39

M52/B28

96-->

Bosch Motronic MS41.1 (OBD-II)

533i

E28

M30/B32

84

0 261 200 008

Bosch Motronic M1.0 Basic

528e

E28

M20/B27

9/84-9/87

0 261 200 027

Bosch Motronic M1.0 Basic

528e

E28

M20/B27

88

0 261 200 154

Bosch Motronic M1.1

535i/is

E28

M30/B34

85-87

0 261 200 059

Bosch Motronic M1.0 Adaptive (24 pin)

535i/is

E28

M30/B34

88

0 261 200 059

Bosch Motronic M1.0 Adaptive (28 pin)

535i

E34

M30/B35

89-92

0 261 200 179

Bosch Motronic M1.3

530i

E34

M60/B30

3/93-8/94

0 261 200 404

Bosch Motronic M3.3

530i

E34

M60/B30

9/94-12/94

0 261 200 404

Bosch Motronic M3.3 w/ air pump

530i

E34

M60/B30

1/95-4/94

0 261 203 484

Bosch Motronic M3.3 w/ EWS-II

540i

E34

M60/B40

thru 12/94

0 261 200 404

Bosch Motronic M3.3

540i

E34

M60/B40

1/95-->

0 261 203 484

Bosch Motronic M3.3 w/ EWS-II

540i

E39

M62/B44

96-->

0 261 203 474

Bosch Motronic M5.2 (OBD-II)

M5/M6

E28/E24

S38/B35

87-88

0 261 200 079

Bosch Motronic M1.0 Motorsport

M5/M6

E28/E24

M88

84-88

0 261 200 055

Bosch Motronic M1.0 Motorsport

M5

E34

S38/B36

91-->

0 261 200 350

Bosch Motronic M1.2

633csi

E24

M30/B32

84

0 261 200 008

Bosch Motronic M1.0 Basic

635csi

E24

M30/B34

85-87

0 261 200 059

Bosch Motronic M1.0 Adaptive

635csi

E24

M30/B35

88

0 261 200 150

Bosch Motronic M1.1

635csi

E24

M30/B35

89

0 261 200 179

Bosch Motronic M1.3

733i

E23

M30/B32

84

0 261 200 008

Bosch Motronic M1.0 Basic

735i

E23

M30/B34

85-87

0 261 200 059

Bosch Motronic M1.0 Adaptive

735i/iL

E32

M30/B35

88

0 261 200 150

Bosch Motronic M1.1

735i/iL

E32

M30/B35

89-92

0 261 200 179

Bosch Motronic M1.3

740i/iL

E32

M60/B40

9/92-4/94

0 261 200 404

Bosch Motronic M3.3

740i/iL

E38

M60/B40

1/95-->

0 261 203 484

Bosch Motronic M3.3 w/ EWS-II

740i/IL

E38

M62/B44

96-->

0 261 203 474

Bosch Motronic M5.2 (OBD-II)

745i

E23

M102/B34

05/83-87

0 261 200 013
0 261 200 024

Bosch Motronic M1.0 Basic

750iL

E32

M70/B50

88-90

0 261 200 156

Bosch Motronic M1.2

750iL

E32

M70/B50

91-->

0 261 200 352

Bosch Motronic M1.7

750iL

E38

M73/B54

9/94-->

0 261 203 473

Bosch Motronic M5.2 (OBD-II)

840i

E31

M60/B40

9/93-12/94

0 261 200 404

Bosch Motronic M3.3

840i

E31

M60/B40

1/95-->

0 261 203 484

Bosch Motronic M3.3 w/ EWS-II

840i

E31

M62/B44

96-->

0 261 203 474

Bosch Motronic M5.2 (OBD-II)

850i

E31

M70/B50

91-->

0 261 200 352

Bosch Motronic M1.7